Nikkan Sports notes that the Nippon Ham Fighters will likely start Yu Darvish on 5 days of rest over their remaining 48 games of the season. That means he could get an extra 1-2 starts, which could also end up being the difference between the Fighters finishing in first and the Fighters finishing in second.
Darvish's possible starting schedule based on 5-days of rest:
8/25 vs Rakuten Eagles at Sapporo Dome
8/31 vs Chiba Lotte Marines at QVC Marine
9/6 vs Softbank Hawks at Sapporo Dome
9/13 vs Chiba Lotte Marines at Tokyo Dome (Monday is a day off)
9/19 vs Seibu Lions at Seibu Dome
9/25 vs Orix Buffaloes at Sapporo Dome
10/1 vs Chiba Lotte Marines at QVC Marine
10/8 vs Seibu Lions at Sapporo Dome (Friday is a day off)
10/14 vs Orix Buffaloes at Sapporo Dome
The Fighters do play 10 more games against the Softbank Hawks, so it's possible that an adjustment is made in his schedule so that he starts more games against the Hawks. In fact, if the schedule is adjusted properly, Darvish could make up to 3 starts against the Hawks (like 9/5, 9/17, 9/28).